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15f-5f-1=19-10f
We move all terms to the left:
15f-5f-1-(19-10f)=0
We add all the numbers together, and all the variables
15f-5f-(-10f+19)-1=0
We add all the numbers together, and all the variables
10f-(-10f+19)-1=0
We get rid of parentheses
10f+10f-19-1=0
We add all the numbers together, and all the variables
20f-20=0
We move all terms containing f to the left, all other terms to the right
20f=20
f=20/20
f=1
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